Credit: DR NAJEEB LAYYOUS, www.layyous.com/SCIENCE PHOTO LIBRARY

Caption: Ultrasound scans of 13-week-old twin foetuses. 2D (grey) and 3D (orange) ultrasound scan footage of twin foetuses that have reached the 13th week of development. At this stage the foetuses measure around 7.5 centimetres in length. At around this time, the brain significantly increases in mass and becomes structurally developed. Birth occurs at around 38-40 weeks. Ultrasound scanning uses the reflected echoes of high-frequency sound waves to image an unborn baby. This safe, non-invasive method is used routinely in pregnancy to assess the growth and health of the developing foetus, and detect any abnormalities.

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13-week-old twin foetuses, ultrasound scans

K007/0307 Rights Managed

Downloadable master

Duration: 00:00:30.08

Frame size: 640x480

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 116.6M

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Capture format: Digital Image Sequence

Frame size: 6480x480

Codec: MS-CRAM

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